Automatic telephone system.



A. E. LUNDEL'L'. AUTOMAUC TELEPHONE SYSYEM. APPLlCATIO FILED IML i4. 1916.

Patented July 10, 1917.

` A. LLUNDELL. AUT'OMATIC TELEPHONE SYSTEM.

'Patented July 10, 1917.

2 SMEETS-SHEET 2 APPLICATION FILED l).N. 14| l9l6. 1,232,582.

A /nVen/o/ l A/en Lande/l To all whom it moy concern.' 1 hns for its .purpose the. control of thecir- 515 roi 'Now York, ha'vc inventori certain new the middle of'Fip. 2,' controls t I opci'utor] Switching fleiicns, ani] particularly -deiicc atltho contrai oliicc. i i'i-.gisti-.r-GU() 4will he i'cFi-.rrcd to 4:154 the cliriF UNITED STATES PATENT OFFICE.

ALBEN E. LUNDIELL, oF NEW YonKjN. Y., AssrGNoB, To WESTERN ELECTRIC COMPANY,

INCBPOEATEDfOF NEW YORK, N. Y.',VA 'CORPORATION OF NEW YORK.

'AUTOMATIC TELEPHONE SYSTEM.

1,232,582. pccllloation of Letters Patent.' "Iutnted July 10, V1911.

nppiioaiion nidnmuary 14,1516. seriaixmmm.'

Beit known that I,v Amami E. LUNDELL, cuits of lthc Selector Switch shown at, the a ycitizen of thciUnitecl-Stntcs, residing .itt right -i'ny Fig. 1. Now York, in th'county of Bronx and State qcriiicnce switch 300, which npgeurs near e' circuitS'- uni] 'iiscfiil Improvements in Automatic Tol of thc sender'co'rd inrli-.r i-ndicalcilnt'the left 60 ephonc Systems, offwhich 4the following'is in Fig. i2 by moi-ans of. which the o erators .a fii|l,oleaif, con`cisc, and exact (Inscription. scnrlor is=joino l to ii sclcctcrl corti) circuit', This ini'irntion i'clnti-s to aiitomiitic tulo :irirl sequence switch 400 controlS the operaphone systems iii which the connection hw lion of thc opcx'ators sending device. The timori milling sind frnllcil lines is cstiihlishiwl siiiiiienrre Sivit-fill SU'UIUNS' 500 und 600, 66- wholly or in part hy moans of iniichiinicsilly which appear at th right in Fig. Qfare two of Ihf. riill 'registuring devices' which take to Systems of thc :ihm-'o cl'nirnciqer in which iip this lcsign'ation of i1 wantcrl iinc and :il Switrzhing rlci'iccf;y :im ooncontr-ol this operation if-thc sending device in :irroirliini'ia thiircwith. Rngistrir'() We 70 will tcrrn thc class rif-service registcrand siirhiiiochiinirl tiovllorl in their inoi'urnent h ynimins of an opisriiiors rlzontrollinp fricchnninrn'or Sunfling The, i'irinoipnl ohjar-.tof thisl invcntion rcti'irrt hriish registi-.1'. Rogifet'eriicvices of the of the :1l-mvo. rlcscrihc'rl chiiractor i'n which of tho'iihoi'v. notcrl Mcicrty patent. achV 764 Switches: hahving :i 'pliimlity of norrriullymi of thc scqiicnco switches is proi'irl'odl With' ti'nctml hi'iishcs "unil rriiigrmts 'for goifci'riini.,r muster i-Unmut. In nach instance the inastr yihi. riilcasc of a tlcsiircrl brush SQL. nrc crnoontuiui. of u gseqiienco Switch infindicated.i ploycd,V Qfiimiiits for snit] mitgncts -oo'non tii5:.rlifi ivings irrimiefliatciyf nboie 'its lrollcil directly. ut' 4thooporsitors` Sending pf'i\\'oi"iniiggriot and is inrlicnteflby u rcfrf, 80 mechanism. oni. rzhiifraotur (ending in 01, the hundreds OthtrY frgiitiirr-.fiy which aro ilrr'ziflcnt tothe fli'git of tine-riffifriii'iov character being/the oniijiist rnient'ion'fzil will appear as thi: flo- Hnmye'zls that; ofrth soqiii-,nf-.'swith it"c0ri'- scription of tho invention progressifs. trois. -Thcso innstiercontacts areiopen. only.'

ln the rlmwingn, V["ignrci; 1 anfl Q, "with nt thu sof'iiunce switch positions nrlicatcd 86- Fg. l nl. tho. top, fliiigrfiiniriiitirially indicato h'i' thi: 4irelniiimzo irhnrziitieis niljcenttherethv. apparatusanrl' i'io'nlons; of the circuits to.- 'lhf-nirnhiiriiiftors ihieri-.forezinilicae the i-iniiloywl in ii iili-.|'ihono systiirn '.rrihor1yi.ng only positions at which ihr: sequence switches thi. present, invention 'y (mn stop. Allthc otlii-.r sieqlirfncc-switchcon- 4Tho--r'rir-,chiiiiihzin` ,fir rnocha'riical 'stri'intiircs tants am opc'n "at illl positions cxccpt those 90 i o charactre ad jacent thizrfito'. l'h'c iziintnfzth'- governed by t nach o-the sovcriil'-.Seqiinnce=switches are 'Tiiihn' (liiiiiiirigriz,V i plurality lof 'scqi-imoesupiii'iitod from those roi/meri hy the others j i sii'itzi-iios "mur iiir'liiziitcil.. lfl'iesie s -ziqiiciioe hy i'lottwl limes unil' thi. zi-infinies of-the'shcetfi y95 sii-itchres'inny hcsin'iihu in siii.i'lntiii-c to that i of thc drawings :,iiiil ciif'h scqicnce s witch shown in patienttoRcynohis &- Iiitlflwino. contact is inrl-iizat'oil on 'thc ilrnwingi; y a, 1.127.?1QH. :iiirl sii'riihirin, oni-.rsitioni'iinil fiinc l ruft-.rcico.r:huriir:tni, tho. h'ilnilrvl` digit Vof. tion tothe corresponding scqi'ncc sii'itffhies 'which 'is this saine iis tho hiindrefls digit of shoii'nin [nitrenitw to Molerty'gbo. 1,125,579. tlieisieqiienf-r.- switcfiigoverning it? 10i) i 'l-wo siqiioncc switch structurs nrcshown The solcctor switch 102,A shown, at .thc 'ri Fig. 1. 'Squence .sw-itc 4QOCrat thc upper right in Fig. l 'if this ilr'gwing, may bc s-iiniloft co'r'nci' .is the' opriinoirs listen'iiignge.- hir in' g-:i-riiotiir and operation to thatrlisquorum switch, und-iolierates vto conncct the.. closcri'in Mr nrpliciition tor-James L. opie'rati'is listening-set to ii Sfilectedcarii cir- Qiiiii'rii'., Serin 50i.' 32,811.9; lefl June- 8, 105, fruit 4infn mannersimilarto th sequence 1915'.- 'This-"switch in provided with fi. phil l l riility o'f sts 103'of multiply -fwinnecte-d hriishe'si" Each set of brushesfis provided,

with a controlling device 104 which normally maintains the brushes ofthe set 1n retracted or inoperative position.

It will be understood that a group of 5 these selector switches are prov'i ed, and that the brush supporting shafts of the several switches are arranged Substantially ara-lle] to each other and 1n the seme plane. Xten'rling parallel to-said shafts and adjacent to, but just below, the correspondin brush sets of each of4 the switches, is a brus i tripping spindle 105 which is provided with' a plurality of yokes 10G, one for euch switch in the group; and upon rotation of any vspindle 105 by its o erating or trip magnet 117 Athe yokes 10B-t ereon are placed in the path of the controlling members 104, re-

's ectively, of all switches which are then in their normal positions. ',Ihen, upon the beginning of the upward movement of a selected switch, the brush set at the level of the actuated trip spindle 105 will be releused so as 'to engage the stationary terminals in the section of the Contact bank over which it passes.

Adjacent to the lower end of thebrush supporting shaft is a air of constantly riven power drums which rotate in opposite directions. The elevating bar is'ar- 3o ranged to be forced into`.operetive engagement with one or the other of said drums by the up-drive clutch magnet 107 or the downdrive clutch ma net 108 respectively, as "shown in the Mcuarrie application.

,35 The .line finder switch 302 at, the left' in Fig. 2, may be of the sume general-character `as the selector switch 102, exce t it is rovidcd with but one set of brus es, an no means are provided for normally holding 4o the brushes 1n inopern tive position.

)Vith this brief (inscription of `the apparatus employed, it believed that the invention will be readily understood'om a descriptionof thc manner in which the apparatusis employed' in establishing a connection.

Assuming now that the subscriber at 109 removes his receiver from the hook, a circuit will be completed through Vthe line 're- 5o lay 110,-which, in attracting its armature', will cause the line lamp 111 to glow. The

operator, seeinglamp 111 lighted, will inl sertthe plug 112 in the jack of the calling line, completing a. connection from battery,

through the cu -oil relay 113, sleeve contacts of the jack and plug and the cord relay '114 to ground. Both relays will operate. Relay 113 will interrupt the circuit .for relny 110, and relay 114- will complete circlit from` en ground through its amature and front contact, sequence switch contact 202 (1) .and motor magnet of sequence switch 200 to battery and ground. This will cause the sequence switch 200 to be moved out of posio5 tion 1 and into position 7 under the control Y ground.

I of its muster contact 20,1.A in position 7, the

lcircuit was closed' from grounded battery through the motor mafrnet of the connecting circuitsequence switch 100, contact 203 (2 to 7),- and contact 115 (l) to ground. Se- 75 quence switch 100 thereupon moves to position 2 under the'control oi.' its master contact 101.

In position 7' of the listening sequence switch a. circuit ,is completed from battery through relay 303` (Fi-g. 2), lower and np-` per sequence switchvcontacts 304 (1), conductor 305, contact 201 (7), and upper contact 115 (2) to ground. Relay 303 is energized und completes a circuit from battery through the. `Imotor magnet of sequence switch 300, sequence switch contact 306 (l), and the front contact and amature of relay 3031 Sequence switch 300 thereupon moves to position 2. ln movin to position 9G 2 the original energizing path igor relay 303 is interrupted at upper Contact 304, but a substitute path to ground is provided through the lower left. contact 30-1 und the back contact and right armature of relay 311. A circuit is now completed from battery through the up-drive clutch magnet 307 of the cord finder switch 302, .sequence switch, contacts 308 (2)V and front contact and. arumture of relay 303 to ground, and the cord finder switch 302 starts to move upward@ lVit-h sequence switch 100 in position Zand the sequence switch 200 in position 7, a circuit was completed from ground (middle Fig. 1), through upper sequence 105 switch contact 115 (2), upper sequence switch contact 204 (7), to the test terminal 309 of the cord finder switch, which represents the selected connecting circuit. Now, when in the upward movement of the switch 302, the Contact 309 is lenga-ged b the finder test brush, the circuit just trace will be extended through sequence switch contact 310 (2), and test relay 311 to battery and lelny 311 will attract its armatures, breaking et its right armature and buck Contact the previously described holding circuit forthe rclny 303, which will retract its armature and open at its front contact the circuit for the u'p-drive clutch mag- 120 net 307 and will close at its back contact a circuit for the motor magnet of sequencev switch 300 thrf'mgh sequence switch contact 306 g2), driving the cord finder sequence witc l-into posit-ion 3.

The operators listening set being connected to the line of the. calling subscriber through the 'contacts 203', 201' (7) of the listening switch 200, she converses with the calling subscriber und obtains the designa- 130 tion of the Wanted line in the usual manner. On obtaining thedesired information, the

operator depressies the keys, in accordance with the humber-.of the wanted subscriber. Only one key 602 is shown in the drawings. This is one of the keys of thedistrict'brush selecting group. .It will` be understood, of course, that other sets 'of keys, office, thousands, hundreds, tens and units sets will be provided in the usual manner.

The registers 500 and 600 are both' con trolled by the district brush selecting keys. l. pon depressing the district brush selecting` key 602, aV ,circuit is completed from battery through left sequenceswitch contact 315 (3) middle ot' `Fig. 2),` the motor magnet of c ass-of-service register. 500, back contact and right armature of register test relay '503. to ground, through the right contact` of key 602i Another circuit is simultaneously closed from battery'through right` contact 315, motor magnet of district brush register 600, hack contact and armature of "relay 603, to ground, through the rightcontact of key 602. Boththe L.register motor `magnets are energized and the registers start rotating.` l p `Whenn the district brush register 600 reaches position a circuit will` be com,k

pleted from battery through relay 316, test or cutoff relay 603, register contact 604 (5), to ground through the key. The relay 603 attracts itsarmatur 'and opens the. circuit for the motor magnet of register 600, causing theregister to stop in' position 5, in`

which position all the contacts, Aadjacent to which appear the numeral 5, are closed.l

The register 500 isalso rotating, and when it reaches position 9, a circuit Awill be coinpleted from battery through relay 316, relay register contact 504 (9),and the left contact of 4key 602A to ground. Relay 503 will be energized and openthe circuit for 1 the'motor magnet of register 500, stopping said register in position 9.V Relays 503 and .603 being now both' energized. a circuit is completed from battery through the motoimagnet of sequencefswitch 300, sequence 'Se "circuit was completed from. battery through "witch contact 317 (3), kfront contact and l ft ari'riatureof relay 503, front contact and armature of relay` 603 to ground through the right contact of key 602, thus causing the sequence switch 300 tomove into posi tion L Sequence switch 300 willl be.' mowed out of iosition t by means of a circuit closed through sequence switch contact 317 1) and contacts of the trip relay and key of the district group register, in a manner similar to` that in. which it was moved out of position 3 by means of contacts controlled hy key 602.

l'n moving out of position 4, the sequence f switch 30.0 is moved to position 6 by its master contact 301. When the cord finder dence switch 300 moved to position 4. a

uppermost trip magnet 117, district brush register Contact 605 (5), class of Service register contact 505 2 to 9), sequence switch contact 403 (1) and sequenceswitch contact 318 (4 to 6) to ground. The .magnet 117 will be energized, thus insuring that the wippermost set oi brushes on the selector switch will be `released when the switchbegins its upward movement. It will he noted that each of the selector switch trip magnets'has al circuit which `may be closed at one of the contacts ot the" district `brush"register at some one of its five positions. i

The connecting circuit sequence switch 100 being now in position 2, the cord finder quence switch 600 in position 6, and the sender sequence switch 400 in position 2,

fa circuit \\.ill extend from battery through relay l20.`both lower sequence switch contac-ts 121 (2), the leftl contact and brush of switch. 302, Aarmature and back contact of stop relay -10-1, the lwinding of stepping relay flfgsequeiice switch'contact 406 (2), and

' contact 3,18 (3 to 8) to ground. This circuit,

which is the iinl'iulse or fundamental circuit, causes the energizationlof relay 120, which completes a ycircuit from battery through the motor magnet oi sequence switch '100, sequence switch contact 122. (2), and the front contact and lcft armature of said relay to ground, causing sequence switch 100 to more to position 3.

As switch` mores to position the cirvcuit foi' relay 120 is opened at the lower left contact 121, but, the relay remains locked up over the fundamental circuit through its right armature and upper left contactll; A circuit is now completed from battery through the updrive clutch magnetlOl'- of selector switch 102, sequence switch contact 123' (3), and the front contact anrlleft armature of relay 120 to ground. This causes the selector switch to more upward. In' its `initial movement, the upper brush controlling device 104 engaged by the correspondingftrip yoke 106 on the shaft 105. causingv vthe release of thc upper set of brushes.

It to he understood that each set of 'brushes of the-selector switch 102 Vis arranged to traverse 1.00 sets of terminalfcoxk `tactsof trunks.4 'il`l'iese trunks will he divided No. 766,165. filed August 22, 1913. `Therefore, when the Afundai'nental or'impulse circuit was closed, as above described," relay o causing the selector .switch was energized by a circuit from battery through rsaid relay, district group reglster contact l, contact 407 (2), contact of stepping relay 405 to ground.

5 Relay o, in attracting its armature, com-v pletes a circuit for its compamon'countmg relay, o and also ior'the cutoli" or stop relay 404 through upper left cfntact 408 (2). AThese. latter two relays are, fhowever,at this time short-circuited by vthe branch to ground through the armature and contact of relay 105.

As the switch moves upward, the stepping relay 405 is shunted by a circuit extending Afrom the upper right .contact 121 (3) through the first conducting segment of commutator `124 and the grounded brush Vv125. Thesegmeuts of commutator 124 are so positioned that one of them will `be engaged by Ibrush 125 as the switch brushes approach the bottom of a group of trunks. These interruptions or short circuits of the relay 405 measure or count the number of groups passed over by the switch brushes, 25'

relay 1405 being denergized once for each group passed'ovcr.

The dotted lines extending to the left from upper and lower sequence switch contacts 408 indicate the cmiductors arranged to form portions of the locking circuits for the other counting relays.

In the case assumed, when relay'405 retracts its armature the first time, diie to the short circuit through the lowermost'segment of the interrupter 124, short-circuit from relays o .and 404 and they will be energized in a circuit in series with relay 0.

Relay 404, being energized, the energizing circuit extending through relay 120 will -be interrupted as soon as the brush 125 passes from engagement with the contact Segment on the interruptor 124. Relay 120 will then retract its armatures, completing a circuit from battery through the motor magnet of sequence switch 100, contact 122 (3), and back contact and left armature of relay 120 to ground. wWhen the left armature of relay 120 was retracted, it interrupted the circuit for the motor magneg: 107, to pause at the beginning of the selected group. vAn instant later, the circuit previously traced for this clutch magnet is opened at sequence switch contact 123 (3). Trunk selection or hunting in the selected group may take place Vin the usual, and well-known manner.

With the energiiation ofthe last counting relay o', a circuit was completed from battery vthrough the moto;` magnet of sequence switch 400, contact and armature of said relay, and upper right sequence switch contact `408 (2) tov ground. Sequence switch 400 thereupon moves out of, position 2 and J linto position 4' under the controlv of its mas.

and armature and to move out .of

it will remove the.

sequence switch 100, Vcontact 122 ter contact 401. In moving out of position 2, the holding circuits for all the countlng relays which have been operated and locked up, as well as relay 404, are interrupted at sequence switch contact 408. These relays thereuponfall olf, and When'the sequence switch 400 reaches position 4, a locking circuit' is provided which will .be eectiveupon the next energization of the counting relays.

'switch 400 moved to position 3, a circuit was established from battery through 'the motor magnet of switch 300, Contact 317 (6) and y contact 409 (3). This will cause switch 300 position 6. In position 7, it closes a circuit at Contact 312 for the release magnet 506, thus causing key 602 to return to itsnormal position. This contact may also close'circuits4 for the release magnets of all-other key sets.. During the subsequent sending operations, the sequence switch 300 will be moved through its successive positions, comingto rest at'the end of the ysending operatlon in position 15. Likewise the sequence switch 400 will be moved throughy its positions 4,-6, 8, 10, 12

and will have'been moved to'lp'osition 16 at the end of the sending operation.

During the selecting operation at the switches beyond the selector switch 102, the fundamental circuit 'will Asubsequent switches through sequence switch contact 126 and one of the brushes of the selector switch 102, in a manner which isfwe'll understood. l

It was above described how sequence switch was moved to position 11 :during the establishment of a connection. Now when sequence switch 400 moves to` position 16 after the last operation of the opeators be `extended to the y i imk controlling device a circuit was established i from battery through the `motor magnet of (1.1)5 the r1ght contact and brush of switch '302 and sequence switch contact 411 (16) to ground.

Sequ'enceswitch 100 will thereupon be moved out of position 11 into position 12. We will assume that sequence switch 100 `is in position 12 while the called subscriber is bein rung, and, that upon response ofthe called subscriber, it moves to position 16; the talking circuit will now be completed at con tact-s 127 and 128 (16). l It will be recalled that relay 311 was ed up by a circuit extending through tact 310 (2A to 16 ture, the secondrom-the-leftbrush and contact of switch 302, and sequence y lock; con its left Contact and armai ground.4 "Sequence switch n moves out of position '16 and back to nor- (2, to L11) .to mind. L Now, when the scquenco vswitch 00,1noycs out ofposition 11l comp eting a circuit from battery thro the motor-iriagnet f of sequence switch V3 contact 319, (15) and the back contact'an right armature relay 311 to ground. The

Sequence switch 300 will thereupon move to iosition 17, when a circuit will be completed imm battery through the motor magnet of sequence switch 400wntf'ict 410 y (10), scquencc switch contact 319 (17), and back Contact and right Varmature of relay 311 to 400 thereupon mal or position 1. Acircuit is now com- --pleted from battery through the release and switch 302, a (1), sequence down-drive clutch magnet 320 of sequence switch contact /1-10 switch contact 319 (17'), and. back contact and right armature of test. relay `311 ,to

ground. The sender cordiinder thereupon returns to :its noi-mal iosition. As it ap proaches normal, the o '-norinal eontaet'321- 1S closed, vcompleting a Ithrough 'the clutch circuit ifioin battery ma net of sequence switch 300, sequence swite contact 306 (17), and the olf-normal contact; 321 to round, thus driving the sequence switch 300 ack` to its normal position.

- complished by The registering devices en'iplo'yml lhave no normal position and i'en'iain in the position 1n which they werelast used until the oper` ator employs them in establishing another Vcall; i"

` When the' connection is coirlplotcd,y the" 1 operator will remove her set from the coi-d circuit -hy causing her sequence switch'200- to move out of position` 7. This may be ac# depressing the lislen'iligfout key 205 which will 'causeswitch 200to inove to4 osition'1\]. In practice, however,v will be rought about autoinatieaIly,aS inappliferrcd to. n i

Upon the terinination of the conversation, When the subscribers replace their reivers upon the hooks, the supervisory disconnwt elgnals (not shown) will be displayed in ther usual manner. .lhe operaor, observing the disconnect signals, will remove the plug 112 from the jack of tliecalling line, causin the deneifgization of relay 114.` `:Relay 11i in retracting its armature, completes a circuit frorn'battcry through the motor magmoves to position 1, thus closing a circuit et 'of switch200, ack contact and ground.

contact 206 (11.) and the uence switch 200 thcreu n from battery through the motor magnet of seqliei'icc niet 13e (1),

switch 100, sequence `switch con- (16) sequence" switch contact 206 andthe back contact and armature of tact, sequence switch contact 130 application above ire-Q armature of relay 114.1;01

4relay 114` to ground. This will move the sequence switch v out of position 16, and it will 'go to position 18 under the control ofgits master contact' 101. 1n positionlS, acircuit :is completed from bat-V tery through the' release and` down-drive clutch magnet 108 and eequenee'swltchfcontact 131 (18) to ground. This will retract the holding pawl, and cause the-return to normal of the selector yswitch 102. Asy the switch approaches its normalL position, the right commutator brush will engage theconducting segment y,132, completin a` circuit Vfroniground through said bruI Y (18), and the motor magnet oi' sequence switch 100 to batteryand ground.' Sequence switch 100 and con will thereupon move out oflposition' l'and l tli'e particular brush selected was determined by a sending operation in which' impulses were transmitted from the 'selector switch,

in a manner similar to that for group selection, empio plisliing'this selwtion which is saved'by the present invention `as the group selection may take place immediately upon the depression 1 of the keys and the operation of the register'- de'vice, the trip magnet ,117 bein f energized i ii'nniedi atei y upon lregistration ta so that the necessary brush will u p on the bcginniiig the selector switch.

ing place, be trippial 'of the yupward trave of i ln addition to this time saving element of the present invention, it hasthe Ifurther advantage of being absolutely positive in oper ation.

. *i-Wliat isclaiined is:

' 15in a telephone system, telephone lines,

means .including-a,selector switch for cstablishingn connection fioinoiieof said lines'to of normally inactive brush on said switch,` an operators sendanother, a plurality nig device for coiitrollinii the switches used in esta v nection magnets, one for cach brush set of said selector switch forcontrolling the release of the brushes thereof,V circuits for saidv the operation `f 4 inagnets, and contacts at said sending device for selcctivel y closing said circuits.

2. l'n a telephone system, telephone lines, means including .a Iselector, switch forv estab- 'lishing a connection `from one `of said vlines to another, 'a pluralityof 'normally inactive" brush sets on said selector switch,mag`iets, 'one for cach brush set for controlling the activilty thereof, an operatos sending device inc the designation of a, Wanted line, circuits for said magnets, and contacts on said registers for selective] y closing sa'id circuits.

u'ding keys and registers for recording an interval of rtime in accoinf ieu ilishing said 4coniso' 2l)V i each ofsaid switches, magnets, each being of normally inactive brush sets on each of said switches, magnets, each being arranged to control the activity of the corresponding brush set on any of said switches, an ol erators sendingdevice for recording the esigvnation ofrwantedilines, circuits for said magi nets respectively, undcontacts onsaid sendv 'ing device for'sclnctively closing said circuits to cause the releaseof a brush set inl accordance with the designation of the wanted j. line.

means including any one of a group of selector switches for establishing a connection from one of said linesto, another, a plu rality of normally inactive brushsetfs on f arranged to cause'therelease, of any of the corresponding brush setsf on any of said .switches o an o erators sendin device in`I `cluding eysand registers for recording the designation of wanted liiies,circuits for said magnets and contacts on said registers for vselectively,'closing 4Said circuits.v

` 5. In a telephone-system, a telephonefline', means A :for extending said lineincluding a multiple brush selector switch, a central opmeans including any one of .a group of selector switches for establishing a connecerators sending device, means normally holding the brushes of said switch inactive,

magnets, onegfor each brush set for releas`` ing the lbrushes thereof, circuits forsaid .magnets and contagzts at lsaid sending device at which said circuits may be completed to` release a'des'iredvbrush seto'fV said selector;l

switch.: L

6. In a tcephone means inclu ing anyone'of va group of selectorswitchesjfor extending said lines, a plurality of multiply connected brush sets on each of said selector switches, means nor-y mally holding thebrushes of saidswitches in inoperative position, release magnets and trip devices operated thereby, each device being arranged to release the corresponding brushes of any of saidA switchesya central operators sendin'gjevice including keys' and registers, circuits for' said magnets, andv contacts on 'saidl registers for selectively closing said circuits.-

'7. In a` telephone system, telephone lines, means including a selector switch for estab'- lishing va connection from one of said lines to another, a plurality o f normally inactive c brush sets onsaid switch, an operators sending device including a key set and a pairof registers controlled thereby for recordying the designation, of a wanted line, mago' nets, onevfor each 'of said brush sets for controlling the release thereof, and circuits for said magnets respectively selectively closed l vices common to saidswitchesfoperatmgthrough series contacts of said Registers.

4.' In a telephone system, telephone linea'.

common to said switches, eac

system, telephone lines,

Lacasse I. .L v -SM In a telephonesystein, telephone lines, means including any one of a group of selector switches for establishing a donnee` tion `from one of said lines to another, a ,Y

responding brush set of any of said switches,

.plair of registers arranged Vto. fre# e operationoi an one of the kc s in said set and circuits or said ma i an voperator-s 'sending device including a vkey 'v setand a netsrespectively closed at series contacts of i both ofsaid registers; 9. In a telephone system, means includ' telephone lines,

any one of la, group of see f I,lector switches orestablishing aconnection'h from one of said lines to' another, a plurality ofnormally Iinactive brus'hsets on each of said switches, brush-tripping devices, each being arranged to control -tlie activity of the corresponding brush sets-"of all of saidy y switches,` operatingg-niagnetsvlfor 4said trip- `ping devices respectively, .an o Y rators sending device forprecordin" the'v jesignation ofI wanted lines, circuits 4ors/aid magnets re- ',s'pectively, and contacts onjsaid, sending device for selectively closing.4 said circuits to cause `the release of a brush set inV accordance with thedesignation of the wanted line.

10.` In a telephonesystein,telephonelines,

.tion from one of said lines to another, -a

plurality of normally inactive brush sets on each of fsaid switches, brush-tip ing devices being arranged to control the release of the correspending-brush on'all of said switches, operating magnetsv lfor said devices te ectively, an operatoria` sending device inc uding keys and. registers for recording' the and contacts on said registers for selective designation of wantedjlinesr circuitsv for said 11. In a 'telephone system, telephone lines,

.means for extending said'linesmcludinga" multiple brush selector switch, a central 0p,-v

eratorssending device, iiicludinfr a set of v keysv and,v a re ist-er controlled thereby,

means normally olding the brushes. of'said switch inactive, magnets for said brush setsV respectivelyL for controlling the operation'of said holding means, circuits for said ma "nets, and contacts at said register at whic said circuitsmay be completed to release a desired brush set of said selector switch.`

means including` any. one of` a lgrou of se'- lectorv switchesjfor extending'said nes, a plurality of multiply connected brush 'sets 12. In A'a telephone system, telephone lines, l

on eachv of said selectorswitches, means` nori mally holding thebrush's'of said switches in inoperative position, brush-tripping deiso magnets for said tripping devices rcspec' tively euch being arranged' to control the release of the corresponding brushes of any of said switches, central opcrators sending device including keysnnd registers, circuits for said magnets, and contacts Aon said registers-for selectively closing seid circuits.

In a telephone system, telephone lines, means including any one of a group of sclector' switches for establishing n connec` tion from one of seid lines to another, a

:plurality of normally inactive brushes on meh of said switches, hr|1sh-tripping devices cormnon to Saud swltches, operating magnets ALBEN E. 'LUNDELL 

